Found on the EU forum about new economy

Tupinambis, on Mar 20 2012 - 17:48, said: These numbers probably wouldn't seem so skewed if he didn't consider the E8 and E2, which are serious outliers since their repair costs are getting MUCH higher. That being said, Most of the American tanks as they are can print money like nuts. Part of me is under the impression that the US tanks already make more money than the GE and RU ones, and this is just to balance it out a bit. I've had some insane matches in my E8.
The Chaffee credit nerf vs the T-50-2 and VK credit buff has already been rationalized by the fact that the Chaffee spends a lot more time actually killing things [and making credits] than the other two. With that in mind, this might make some sense. It still sucks, but its somewhat understandable.